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A Radio Device for Educational Purposes Prabhat Khanal
A Radio Device for Educational Purposes Prabhat Khanal

... Before the start of this project, it was decided not to manufacture all the components which would be needed in this project by author himself because manufacturing all the components would take more time than the time allocated for final year project and need vast knowledge and research. Therefore ...
Data and Computer Communications
Data and Computer Communications

... signal through a guided medium varies with frequency  various frequency components arrive at different times resulting in phase shifts between the frequencies  particularly critical for digital data since parts of one bit spill over into others causing intersymbol interference ...
5B: ACOUSTIC RESONANCES
5B: ACOUSTIC RESONANCES

... output voltage vout shows a maximum at the resonance frequency f0, which is analog to maximum amplitude we saw before for the resonating air column. The maximum output voltage and the sharpness of the resonance, Q, are determined by the total resistance and the inductance in the circuit. Note that t ...
Gilbert Cell
Gilbert Cell

Lab 2 - Full wave rectifier
Lab 2 - Full wave rectifier

... was behind rectifying a time varying signal today we shall build our own circuit. If we examine the circuit diagram in Fig. 1 we shall notice some peculiar features not present in last weeks lab. ...
Chapter 4 - William Stallings, Data and Computer
Chapter 4 - William Stallings, Data and Computer

SGB-6433(Z) 数据资料DataSheet下载
SGB-6433(Z) 数据资料DataSheet下载

... The information in this publication is believed to be accurate and reliable. However, no responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any infringement of patents, or other rights of third parties, resulting from its use. No license is granted by implication or ot ...
PM 6669 High-Precision Frequency Counter Specifications
PM 6669 High-Precision Frequency Counter Specifications

... reference signal is connected. The use of an external reference signal is indicated on the display. Input frequency: 10 MHz ± 0.1 MHz Coupling: AC Sensitivity: 500 mV rms Input impedance: approx. 300 Ω at 10 MHz Max input voltage: 15 V rms ...
PHzMon_Doc2
PHzMon_Doc2

... with the frequency data based on programmed rules and commands received from the PC. The data is typically transmitted to a PC via RS232 at the PC's request. Optionally, the data can be stored in an external MicroChip 25xx1024 EEPROM for stand-alone data logging. Since data stream is continuous, sta ...
Resonant Circuit
Resonant Circuit

Basic experiments of electronics
Basic experiments of electronics

... resistance from the function generator with increasing input-voltage so the outputvoltage will decrease simultaneously. The error in Fig. 5between the fitted curve and the ideal curve is greater than in Fig. 4 although they represent the same the same relation. Due to the defect oscilloscope we firs ...
Active Bioresonance Therapy Device
Active Bioresonance Therapy Device

... acute respiratory infections can be easily treated within one day without using medicinal preparations. A small part of the body's own microflora dies during the procedure, but this does not affect the whole body in any way and is restored quickly. Bioradiation spectrum All living things emit their ...
Lecture 5: RC Filters. Series Resonance and
Lecture 5: RC Filters. Series Resonance and

... That is, Q is the ratio of the resonant frequency divided by the 3dB frequency bandwidth. A series RLC circuit is used as the RF Filter in the NorCal 40A. (See Fig. 1.13 and the circuit on the front flap.) You’ll start the construction of this filter in Prob. 8. Recall that in a superhet receiver, t ...
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Amplificatoare electronice

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frequency modulator

...  Circuits used to recover the original modulating signal from an FM transmission are called: ...
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... Total Low Frequency Response of Amplifier Composite Bode plot of a BJT amplifier response for three lowfrequency RC circuits with different critical frequencies. Total response is shown by the blue curve. ...
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... The results of table 1 are plotted in figure 2 as continuous line. It is possible to see that the amplitude characteristics for this single time constant low-pass filter could be very well constructed by drawing two straight lines, which intersect at the frequency ω = ω b . This frequency is called ...
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... Q = centre frequency/bandwidth. It is a measure of how ‘spread out’ the response curve is. For low Q values, the curve is very broad. High Q values result in a very sharp, narrow curve that is focused around a peak (resonant) frequency. If a high-Q filter is excited by a signal near its centre frequ ...
VersaSync Rugged Time and Frequency Reference
VersaSync Rugged Time and Frequency Reference

... Some of the VersaSync I/O interfaces are configurable in terms of type and coding/modulation. When a number of available interfaces is identified as ”Max” the actual number of available inputs or outputs is dependent on requirements for other signals. If “Max” is not identified for an interface, it ...
EXP 6 Active Filters
EXP 6 Active Filters

... A filter is a circuit that produces a prescribed frequency response as described in the experiment on Passive Filters. Passive filters are combination circuits containing only resistors, inductors, and capacitors (RLC). Active filters contain resistance and capacitance plus circuit elements that pro ...
HMS-10 Datasheet
HMS-10 Datasheet

1 - Telecommunications Industry Association
1 - Telecommunications Industry Association

... measurement. If the value obtained is lower than the most restrictive limit specified for that frequency range, then the signal levels in 8 kHz bands in that range will be lower than that specified for the most restrictive 8 kHz band. However, the main procedure of Section 9.16.5 should be used when ...
Heathkit SB-401 - Orange County (California) Amateur Radio Club
Heathkit SB-401 - Orange County (California) Amateur Radio Club

Principles of Electronic Communication Systems
Principles of Electronic Communication Systems

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Superheterodyne receiver



In electronics, a superheterodyne receiver (often shortened to superhet) uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original radio carrier frequency. It was invented by US engineer Edwin Armstrong in 1918 during World War I. Virtually all modern radio receivers use the superheterodyne principle. At the cost of an extra frequency converter stage, the superheterodyne receiver provides superior selectivity and sensitivity compared with simpler designs.
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